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Table of Content
20 May 2007 Volume 26 Issue 5
著者文摘
How many turns e-ray rotates as the Iceland spar spins one turn
. 2007, 26(5): 3-3.
Abstract
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526
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(276KB) (
554
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Based on the direction of e-ray calculated with Huygens principle, the problem of how many turns the e-ray rotates as the Iceland spar spins one turn is analyzed and discussed.
The statistical law of the nearly inde ndent particle system①-- Computer simulation of the statistical law of 2D nearly independent particle system
. 2007, 26(5): 7-7.
Abstract
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703
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(420KB) (
323
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Based on the model of hard sphere, the computer simulation of particles of the two-dimensional nearly independent particle system is reported in accordance with mechanical laws. In the simulation, multi-measurement are taken on the energy and speed of particles of the system at different time. The statistical average is performed over the results of measurements. The distribution diagrams of particles against their energy and speed in the mechanical system, with different number of particles, are obtained, and hence the universal distribution function is acquired. This completely proves that the long-term behavior of mechanical system that consists of a few particles has definite statistical law.
The statistical law of the nearly independent particle system②--The distribution function of the nearly independent particle system
. 2007, 26(5): 12-12.
Abstract
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749
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(205KB) (
584
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Starting from Gibbs microcanonical ensemble theory, the distribution function of the nearly independent particle system that consists of any number of particles is derived. This distribution laws takes the Maxwell distribution law as the limiting case when the number of particles N aproaches infinity
Approximate formulas of a simple pendulum： numerical derivation and comparison with MATLAB
. 2007, 26(5): 15-15.
Abstract
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771
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(275KB) (
1325
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Two approximate formulas with high accuracy are derived numerically with MATLAB. By charts and error analysis, these two formulas and the approximate formulas proposed by other authors are compared with the exact results obtained by MATLAB programs. The latter formulas are also modified by optimization method. It demonstrates that using scientific computation software to solve nonlinear problems is an easy and accurate way.
Approximate formula for the period of a simple pendulum
. 2007, 26(5): 18-18.
Abstract
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726
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(144KB) (
903
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A more precision formula for the period of a simple pendulum is obtained by using the method of variable be partly fixed.
Notes about the study on forced oscillation pattern of A2B model
. 2007, 26(5): 20-20.
Abstract
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480
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(219KB) (
509
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Some problems of the study on forced oscillation pattern of A2B model are discussed.
A study of the swing period of a shaft-shaped synchronous satellite by analytic mechanics
. 2007, 26(5): 22-22.
Abstract
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574
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PDF
(347KB) (
354
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The differential equation of shaft-shaped satellite moving circularly around the Earth is studied by analytical mechanics, and its swing period is given. It is pointed that the swing in the meridian plane of the Earth is impossible.
An analyse about the factor affect parachute alarmingly dangerous
. 2007, 26(5): 27-27.
Abstract
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619
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(221KB) (
379
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The factor affect parachute alarmingly dangerous is analysed.
The eigenvalue perturbation calculations of potentials similar in shape with coulomb potential
. 2007, 26(5): 29-29.
Abstract
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661
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(214KB) (
461
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Using the Hellman - Feynman （HF） and Hypervirial （HV） theorems, the perturbative coefficients of the eigenenergies are calculated in the case of Coulomb potential with a radial linear term and a constant term. The calculation method, excel to the usual Rayleigh- Schroedinger perturbation theory （RSPT）, does not require the calculation of eigenfunctions coefficients. This method is a fast and efficient tool for the calculation of large order eigenenergies coefficients.
Discuss accuracy question about measuring wavelength for ultrasonic velocity definite using phase method or extreme value method
. 2007, 26(5): 32-32.
Abstract
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824
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(224KB) (
749
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In the experiment for measuring ultrasonic velocity, the accuracy in measureing wavelength by extreme value method or phase method are discussed, through experiment and theory＇ analysis, it is proved that accuracy of phase method is better than that of extreme value method in measure wavelength at one time, it is better to measure an extreme value rate point than a extreme value point.
Measurement of track pitch of the optical disk and signal trace length
. 2007, 26(5): 35-35.
Abstract
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855
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(161KB) (
1287
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From structure of optical disk, its signal trace can be viewed as a reflection grating, so track pitch of optical disk and the length of the signal trace on a CD can be measured.
Near-field optical experiments based on Michelson interferometer
. 2007, 26(5): 37-37.
Abstract
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793
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(339KB) (
360
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A kind of near-field optical experimental device based on Michelson interferometer is introduced. The device can be used for measurement of evanescent field exist in the near-field of prism surface when total internal reflection occur, also it can be used to observe the near-field optical structure of two dimensional grating and experiments of photon scanning tunneling microscope in principle. It is helpful for students to understand the structure of evanescent field and basic principle of scanning near-field optical microscope. The device is simple and easy to operate;also it has the advantage of high reliability, so it is suitable to be applied in physics experiment.
Theoretical simulation of alpha scattering experiment
. 2007, 26(5): 40-40.
Abstract
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1072
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(303KB) (
861
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Based on a single scattering theory of alpha particle, the contribution to the total scattering from the second atom are included, and the relationship among the scattering angle and other scattering parameters is established. By adjusting the scattering parameters,such as incident energy of alpha particle and the position parameter of tow atoms, the distribution of scattering probability in different conditios is simulated.
Discussion about teaching in complex and design experiments
. 2007, 26(5): 44-44.
Abstract
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582
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(343KB) (
831
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How to carry out complex ＆ design experiments in lower grade undergraduates is introduced. According to the lab condition, the maneuverability and operability are considered in setting experiments. The graduation of experiments is arranged to make students carry out easily. The key for teaching methods is to give students reasonable direction, and to excite their interests about research.
Theoretical models for frequency dispersive media
. 2007, 26(5): 48-48.
Abstract
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647
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(358KB) (
1166
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The theoretical models of Debye for dispersive media,of Drude and Lorentz for the electrical conductivity are surveyed. The dielectric property of the left - handed material is discussed using lossy Drude＇s model. It shows that different model based on different physical mechanism is suitable for different kind of dispersive materials in practical use.
Teaching practice of digital technology on nonlinear physics for students of engineering
. 2007, 26(5): 53-53.
Abstract
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633
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(421KB) (
284
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Digital technology has been of wide application to nonlinear physics Of fundamentals. For students of engineering,a short-period scheme was designed on teaching nonlinearity in fundamental physics within digital technology and a good effect has been achieved.
A study on damping coefficient of tuning fork
. 2007, 26(5): 58-58.
Abstract
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1182
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(323KB) (
598
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With the high accuracy of computer-based collecting device, the damping coefficient is measured and the theory that the damping coefficient fl remains constant in damped vibration is revised. A linear relation of β and the velocity amplitude A is presented based on the data obtained. A further experiment is performed in which the linear relation of β and A is confirmed by the measuring of instigative force and velocity amplitude under the state of resonance. Considering the relation of β and A, the differences of the results obtained by the two traditional ways are explained.
The calculation of the interacting energy between conductor and point charge
. 2007, 26(5): 62-62.
Abstract
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780
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(166KB) (
357
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When an uncharged conductor is moved to the electric field produced by a point charge, there will be induced charge distribuion on the surface of the conductor. It is proved that for conductor with arbitrary shape, the interaction energy between the point charge and the conductor is half of the coulomb interaction energy between the point charge and image charges. Furthermore a very simple understanding to this result is provided.
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